Yes.
Livestock haulers don't have specific rest areas where they might pull over. If they've maxed out their hours of service, they use whatever facilities are available. Feed, water and rest are few and far between, and they are ill-equipped to accommodate truck drivers versus the livestock.
The concern is this: Those trucks pull over into truck stops, just like cargo and freight trailers do, and sit there.
Folks were talking about passive ventilation; if it's 30°C outside and all pavement.... I travel the 401 far too frequently, and it's nightmarish at best. Those truck stops are very crowded with trucks and with the general public, and the general public get out to stretch their legs and walk around.
Now you have a trailer full of animals at 30°C with no ventilation, stopped because it has maxed out its hours of service and there's no other place to do it. People look at the animals and become concerned and try to give them water, or they go to the truck driver and say, “What are you doing? There's a problem. You need to do something about it.”
Do we want that truck driver to say, “The government makes me do it?”